Validation and Enhancement of a Supermesh Strategy for the CFD Simulation of Four-Stroke Internal Combustion Engines

Abstract

The present paper describes and validates an efficient CFD implementation to replicate the working fluid-dynamics of a real four-stroke internal combustion engine. To do this, experimental data obtained on a single-cylinder engine are used to validate the proposed computational approach. The engine domain is divided into regions according to each moving zone, and these are coupled using a pseudo-supermesh interface presented in a previous work by the authors. In this work, the original pseudo-supermesh strategy is enhanced by introducing the dual-boundary concept to model the valve opening/closing events to increase the accuracy and simplicity of the simulation procedure. The results produced by the proposed software tool show a good correlation to the experimental measurements of the complete engine cycle. Macroscopic quantities of the in-cylinder flow are accurately replicated as well as the instantaneous evolution of the in-cylinder and intake manifold pressure. Furthermore, the present work shows that the computational efficiency and scalability of the enhanced pseudo-supermesh approach are preserved even when applied to more complex real problems. In this sense, this work contributes to a new engineering tool promoting the enhanced pseudo-supermeshes as an effective tool for the design, development, and optimization of internal combustion engines.

Impact of temperature and reaction time on the conversion of polystyrene waste to pyrolytic oil and its diesel engine performance, emission, and lubricity characteristics

“…The average BT value of all tested fuels declined as the speed climbed from 1500 to 2400 rpm. This is because the combustion chamber was not sufficiently filled during the intake stroke, and the valve's volumetric efficiency was declined as a result of the complete opening of the valve because there was inadequate time for a sufficient intake phase, resulting in a decrease in combustion chamber pressure (Aguerre et al, 2022). At 1800 rpm, the highest torque values for PS100 and B10 were 34.0 and 32.3 Nm, respectively.…”